Kolladarungkri, TeeraWongchanapai, WichaiJonggarearnprasert, KowitTumwipart, Narongpon2012-04-022012-04-022001-12Kolladarungkri Teera, Wongchanapai Wichai, Jonggarearnprasert Kowit, Tumwipart Narongpon. A drowsy patient with a positive purple urine test. Siriraj Medical Journal, 2001 Dec; 53(12): 917-921.http://imsear.searo.who.int/handle/123456789/137436We report a pitfall in the investigation of amphetamine poisoning by urine test. A 21-year-old female who came to hospital with drowsiness and was reported to have positive purple urine test. This false positive urine test occurred as a result of drugs and substances of the same structure. Specific investigations were further recommended in order to detect the use of the amphetamines and allow appropriate treatment.enAphetamineMetamphetaminepurple urine testArticle